Final answer:
Option a is the most accurate as it refers to the credibility imparted by the first-person point of view used by William Bradford, giving the reader a sense of immediacy and reliability in the narrative of the travelers' sea journey.
Step-by-step explanation:
The passage provided describes the challenges and emotions experienced by travelers at sea. Option a, which underscores the credibility of the account given by the first-person narrative style, appears to be the most accurate effect of point of view on the reader. William Bradford, who was a witness and participant in the events, writes in the first person and his account injects the narrative with a sense of immediacy and personal involvement, enhancing its reliability and engaging the reader directly. The other options don't align with the detailed excerpts as they either assign leadership responsibilities, state impartiality without bias, or deal with dramatic emotional involvement, which are not directly supported by the excerpts provided.